Imaging of Silicon Naphthalocyanine in Toluene

1997 ◽  
Vol 479 ◽  
Author(s):  
R. J. Becker ◽  
R. V. Goedert ◽  
A. F. Clements ◽  
T. A. Whittaker
Keyword(s):  
Spherical Aberration ◽  
Scattered Light ◽  
Pulsed Laser ◽  
Laser Pulses ◽  
Scattering Data ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Plasma Absorption ◽  
Pulse Energies ◽  
532 Nm

AbstractPulsed-laser shadowgraphs and images of scattered light are combined with limiting and scattering data to build a model of the response of silicon napthalocyanine (SiNc) at concentrations on the order of 10−3 M in toluene to 12–16 ns 532 nm laser pulses over an energy range from 10 nJ to 2 mJ. The inherent spherical aberration induced by the sample has a profound effect on the response. The scattering is extremely intense above pulse energies of 100 μJ. The data indicates the response at pulse energies below 300 mJ is due to reverse saturable absorption. Full absorbance is not observed until the agglomerates vaporize. At fluences approaching 1 J/cm2 a plasma begins to form and the liquid near the window starts to boil. Intense scatter from the boiling liquid combined with plasma absorption produces hard clamping.

Nonlinear Optical Properties of Modified Carbocyanines

1997 ◽  
Vol 479 ◽  
Author(s):  
Nansheng Tang ◽  
Weijie Su ◽  
Thomas M. Cooper ◽  
Daniel G. McLean ◽  
Donna M. Brandelik ◽  
...  
Keyword(s):  
Cross Sections ◽  
Excited State Absorption ◽  
Laser Pulses ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Pump Probe ◽  
Chirped Pulses ◽  
Molecular Hyperpolarizability ◽  
Meso Position ◽  
532 Nm

AbstractWe studied the optical nonlinearities of modified 3,3′-diethylthiadicarbocyanine iodides (X-DTDCI) in dimethyl sulfoxide (DMSO) solutions (X = H, Cl, Br at meso position) by a pump-probe technique with crossed polarized chirped laser pulses at room temperature. Reverse-saturable-absorption (RSA) with monoexponential lifetimes is observed at 532 nm in all the samples studied. We determined the effective excited-state absorption cross-sections and their lifetimes for all the samples investigated and found that they clearly correlate to the substituent X at the meso position. Empowered by the chirped pulses, a much faster nonlinearity with a decay time of ˜3.1 ps that is much shorter than the laser pulses used, is unveiled in Cl-DTDCI. We expressed both the absorptive and the refractive part of this fast nonlinearity as the equivalent molecular hyperpolarizability γ1212 and found γ1212 = (8.1 + i9.8) × 10−32erg−1.

Synthesis of Silver Nanowires and Investigation of their Optical Limiting Properties

2011 ◽  
Vol 295-297 ◽  
pp. 152-155 ◽  
Author(s):  
Ya Ping Han ◽  
Ming Hai Luo ◽  
Qing Wen Wang ◽  
Jin Xin Wang ◽  
Xue Lian Gao
Keyword(s):  
Silver Nanowires ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
X Ray Diffraction ◽  
Current Electric Field ◽  
532 Nm ◽  
State Ionic

Silver nanowires were fabricated in a direct current electric field using a solid-state ionic method, and were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The reverse saturable absorption and optical limiting properties in silver nanowires, suspended in de-ionized water were investigated by using an EKSPLA (PL2143A) picosecond laser, which produced 30 ps laser pulses at 532 nm with a repetition rate of 2 Hz. Experimental results indicate silver nanowires have obvious optical limiting properties.

Saturable and reverse saturable absorption in silver nanodots at 532 nm using picosecond laser pulses

2008 ◽  
Vol 104 (7) ◽  
pp. 073107 ◽  
Author(s):  
Ullas Gurudas ◽  
Elijah Brooks ◽  
Daniel M. Bubb ◽  
Sebastian Heiroth ◽  
Thomas Lippert ◽  
...  
Keyword(s):  
Picosecond Laser ◽  
Laser Pulses ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Picosecond Laser Pulses ◽  
Silver Nanodots ◽  
532 Nm

Photophysics and reverse saturable absorption of cationic dinuclear iridium(iii) complexes bearing fluorenyl-tethered 2-(quinolin-2-yl)quinoxaline ligands

2021 ◽  
Author(s):  
Cuifen Lu ◽  
Taotao Lu ◽  
Peng Cui ◽  
Svetlana Kilina ◽  
Wenfang Sun
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Triplet Excited State ◽  
532 Nm

Dinuclear Ir(iii) complexes tethered by fluorenyl motif exhibited weak 1,3MLCT/1,3LLCT absorption at >500 nm, dual phosphorescence, broad triplet excited-state absorption, and reverse saturable absorption at 532 nm.

Nonlinear Absorption Properties of Spherical Gold Colloidal Nanoparticles

2012 ◽  
Vol 476-478 ◽  
pp. 923-927 ◽  
Author(s):  
Chan Zheng ◽  
Xiao Yun Ye ◽  
Xue Qing Xiao
Keyword(s):  
Nonlinear Absorption ◽  
Laser Pulses ◽  
Phase Method ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Colloidal Nanoparticles ◽  
Free Carrier Absorption ◽  
Absorption Properties ◽  
Liquid Phase Method ◽  
Carrier Absorption

Spherical gold colloidal nanoparticles were prepared used traditional liquid phase method and the corresponding nonlinear absorption properties were investigated by open aperture Z-scan technique using 8 ns laser pulses of 532 nm. The gold colloidal nanoparticles exhibited a transform from saturable absorption (SA) to reverse saturable absorption (RSA) at relatively higher irradiation intensities. The SA behavior presumably owes to the bleach of ground-state surface plasmon resonance (SPR) absorption, while the RSA might result from high excited-stated free carrier absorption.

Dynamic saturable optical nonlinearities in free base tetrapyridylporphyrin

2003 ◽  
Vol 07 (06) ◽  
pp. 452-456 ◽  
Author(s):  
Newton M. Barbosa Neto ◽  
Leonardo De Boni ◽  
José J. Rodrigues ◽  
Lino Misoguti ◽  
Cléber R. Mendonça ◽  
...  
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Optical Nonlinearities ◽  
Free Base ◽  
Photophysical Parameters ◽  
Crossing Time ◽  
532 Nm

Dynamic optical nonlinearities in free base tetrapyridylporphyrin ( H 2 TPyP ) solutions were investigated at 532 nm with the Z-scan technique. We observed a reverse saturable absorption process that was found to have a fast contribution related to the singlet population and a slow accumulative contribution arising from the triplet population. The optical excitations and subsequent relaxations can be interpreted with a five-energy-level diagram that allows determination of the excited states photophysical parameters such as triplet and singlet absorption cross-sections and the intersystem crossing time.

Anionic Surfactant Sensing by Optical Properties of Erythrosin B

2020 ◽  
Vol 18 (1) ◽  
pp. 43-46
Author(s):  
Zainab Saberi
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Erythrosin B ◽  
Ctab Concentration ◽  
Dye Aggregation ◽  
Light Excitation ◽  
532 Nm

The nonlinear optical properties, absorbance and fluorescence spectra of Erythrosin B (ErB) aqueous solution in different CTAB concentration was studied. Z-scan technique under laser light excitation at 532 nm, was used for study reverse saturable absorption (RSA) of ErB. it was observed that the RSA of solution depend on CTAB concentration. A enhancing of absorbance and quenching of fluorescence is observed with increase of CTAB concentration in solution and the RSA can reduce the fluorescence intensity. It was proposed that the micelle can reduce the dye aggregation is solutions and it can affect on linear and nonlinear optical properties of ErB.

Reverse saturable absorption and anti-Stokes fluorescence in mesoionic compounds pumped at 532 nm

2001 ◽  
Vol 40 (9) ◽  
pp. 1389 ◽  
Author(s):  
Nikifor Rakov ◽  
Cid B. de Araújo ◽  
Gerd B. Rocha ◽  
Alfredo M. Simas ◽  
Petrônio A. F. Athayde-Filho ◽  
...  
Keyword(s):  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Anti Stokes ◽  
532 Nm

scholarly journals Silver Nanoparticles under Nanosecond Pulsed Laser Excitation as an Intensity Sensitive Saturable Absorption to Reverse Saturable Absorption Switching Material

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 413
Author(s):  
Edappadikkunnummal Shiju ◽  
Kaniyarakkal Sharafudeen ◽  
T. M. Remya ◽  
N. K. Siji Narendran ◽  
Palengara Sudheesh ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Laser System ◽  
Laser Pulses ◽  
Optical Nonlinearity ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Closed Aperture ◽  
Ag Nps

Optical nonlinearity involved switching draws an important consideration in nonlinear optical studies. Based on that, we explored nonlinear absorption processes in silver nanoparticles synthesized by liquid phase laser ablation technique employing a second harmonic wavelength (532 nm) of Q switched Nd:YAG laser pulses with 7 ns pulse width and 10 Hz repetition rates. The typical surface plasmon resonance induced absorption (~418 nm) confirmed the formation of Ag NPs. The Z-scan technique was used to study the nonlinear optical processes, employing the same laser system used for ablation. Our study reveals that there is an occurrence of a saturable to reverse saturable absorption switching activity in the Ag nanoparticles, which is strongly on-axis input intensity dependent as well. The closed aperture Z-scan analysis revealed the self-defocusing nature of the sample.

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